Device reservation fixes

We recommend using symbolic names like hw:Live but when subdevices are used
regcomp() was failing to parse them. This changeset improves the algorithm
by using less assumptions.

 * Don't attempt to use device reservation when card_to_num() mapping
   has failed. In case of card_to_num() failures, "Audio-1" device
   was reserved on start but not released on stop. This was causing
   next start to fail with out of memory error, and since previous
   commit, with "A handler is already registered for
   /org/freedesktop/ReserveDevice1/Audio-1" error.
 * In case of playback device reservation failure, release the
   capture device
 * Remove unused fReservedCaptureDevice and fReservedPlaybackDevice
   data members of the JackAlsaDriver class

rd_acquire() error handling is adjusted to match libdbus error
handling convention:
 * Initialize error before calling rd_acquire()
 * Free dbus error on rd_acquire() failures
 * Always set dbus error on rd_acquire failures, except for
   detected programming errors that now cause taboo assert.

jack_transport requires libreadline but not libncurses, so drop the latter.

Reportedly, f28523ff was incomplete.

CCFLAGS isn't honoured at all, the proper name is CFLAGS.

Correct JackEngine::NotifyGraphReorder : graph-order callback now notified after port latencies update.

conf.write_config_header() defaults to remove=True, so conf.defines() is
empty afterwards. Consequently, config.h is empty, too.

Set remove to False, so calling it another time for 32_64 builds works.

Closes: #21

ceilf() is used in netsource.c
Fix for trac ticket #291

Opus Netjack fixes

We recommend this at http://jackaudio.org/device_naming

fixes #18

Patch by Adam Conrad <adconrad@canonical.com>, taken from Ubuntu's
jackd2 package.

Fixes linkage errors as described in

   http://permalink.gmane.org/gmane.comp.audio.jackit/25841

Opus Netjack integration

Thanks to Robin Gareus.
https://github.com/jackaudio/jack2/issues/17

Thanks to nedko - closes #15